28840580 has 24 divisors (see below), whose sum is σ = 60806592. Its totient is φ = 11490272.

The previous prime is 28840561. The next prime is 28840583. The reversal of 28840580 is 8504882.

It is a self number, because there is not a number n which added to its sum of digits gives 28840580.

It is not an unprimeable number, because it can be changed into a prime (28840583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2519 + ... + 8001.

It is an arithmetic number, because the mean of its divisors is an integer number (2533608).

Almost surely, 2^28840580 is an apocalyptic number.

28840580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28840580 is an abundant number, since it is smaller than the sum of its proper divisors (31966012).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28840580 is a wasteful number, since it uses less digits than its factorization.

28840580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5755 (or 5753 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 35.

The square root of 28840580 is about 5370.3426333894. The cubic root of 28840580 is about 306.6676722294.

The spelling of 28840580 in words is "twenty-eight million, eight hundred forty thousand, five hundred eighty".